Hauck is the preeminent TBA Blower manufacturer – serving many industries.
Below are several tables and information to help determine sizing and parts for Hauck TBA Blowers.
Configuration – Probably the most confused portion – how to determine what blower you have (Note everything is taken from the motor end):

Next – Determine if you have an ODP or TEFC motor. In MANY cases the impellers are different for each model. Motor plates are the best way to confirm this.
Parts – Below are the casing and impeller parts for the common asphalt TBA Blowers:

Finally – here is the Hauck Operation Instructions for TBA Blowers including the correct way to replace the impeller:
